TY  - BOOK
AU  - Black, John,
AU  - Bradley, J. F.
TI  - Essential mathematics for economists
SN  - 0471077100
AV  - HB135 .B54
U1  - 510 
PY  - 1973///]
CY  - London, New York
PB  - J. Wiley
KW  - Economics, Mathematical
ER  -